INTEGRAL Cross-calibration Status: Crab observations between 3 kev and 1 MeV
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1 INTEGRAL Cross-calibration Status: Crab observations between 3 kev and 1 MeV CESR/UT-CNRS 9 avenue du Colonel Roche, Toulouse cedex 04 - France jourdain@cesr.fr D. Götz CEA-Service d'astrophysique Orme des Merisiers, Bat. 709, Gif sur Yvette - France dgotz@cea.fr N. J. Westergaard DTU Space - National Space Institute Technical University of Denmark, Juliane Maries Vej 30, DK 2100 Copenhagen O E- mail:njw@space.dtu.dk L. Natalucci INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica Area Ricerca CNR/Roma 2 - Tor Vergata, Via del Fosso del Cavaliere, 100, Roma - Italy Lorenzo.Natalucci@iasf-roma.inaf.it J. P. Roques CESR/UT-CNRS 9 avenue du Colonel Roche, Toulouse cedex 04 - France roques@cesr.fr On behalf of the instrument teams We present results of Crab observations by the INTEGRAL instruments. A simultaneous fit allows us to demonstrate that INTEGRAL provides reliable spectra over its wide energy range. The 7th INTEGRAL Workshop Copenhagen, Denmark September Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.
2 1. Introduction This report presents the status of INTEGRAL instrument calibration after the OSA-7.0 release. We first summarize the status of each instrument, then a common fit will illustrate the inter-calibration picture. 2. Instrument calibrations: 2.1 JEM-X The results reported here are based on the OSA-7.0 release with standard spectral extraction. Work is in progress to include the modelling of the gain effects into the next release of OSA. Orbit 300 data: 15 ks of useful duration (ARF derived from earlier observations) JMX1 JMX2 Photon Index = 2.15 ± 0.05 Photon Index = 2.08 ± kev = 11.4 ± 0.1 ph / cm 2 s kev 1 kev = 10.3 ± 0.1 ph / cm 2 s kev N H = cm -2 has been frozen For both instruments, Flux[2 10 kev] = erg / cm 2 s 2
3 2.2 IBIS Latest results from IBIS/ISGRI calibrated mass model (Power Law fits): Orbit 300 (16 ks of useful duration): Photon Index = 2.12 ± kev = ph / cm 2 s kev Orbit 605 (60 ks of useful duration): Photon Index = 2.13 ± kev = ph / cm 2 s kev Crab spectrum measured by the IBIS instrument. ISGRI data (black) are collected during rev.300 (net time: 16 ks) and PICSIT data (red: single events; green: double events) are from revs (net time: 563 ks). Spectra are obtained using OSA7.0. PICSIT data are treated with an average systematic error of 5% while ISGRI data have been added 1% systematics to each channel. The reduced chi-square is 1.73 (61 dof). Results are compatible with SPI ones at a 2σ confidence level. With relatively a good performance below 100 kev, IBIS/ISGRI can effectively measure Crab spectrum and flux. Above 100 kev a spectral break is detected but its position is not accurately determined so we fix it at 100 kev. More work is needed to assess the response at high energies, and to get rid of narrow band residual systematics below 100 kev. The ISGRI response included in OSA-7.0 is derived from MC simulations and corrected a posteriori to match the SPI Crab spectrum. Work is on-going to get rid of this ad-hoc correction by modelling the time dependent ISGRI response, using data from proton counters. 3
4 2.3 SPI Considering the remarkable stability of the instrument, we have chosen to build a total Crab spectrum with all data available with 17 detectors and 5 5 dithering patterns (See poster by Jourdain & Roques, these proceedings, for more details). This results in 326 ks of useful duration, distributed over 7 revolutions, from September 2004 to September When going toward higher energies (~ above 100 kev), we can see that the global shape presents a slight curvature that can be approximated by a break in the (low energy) power law, suggesting a broken power law model. However, in this framework, we are facing a strong degeneracy in the parameter determination that we have chosen to solve by fixing the energy of the break at 100 kev. Data are adjusted from 23 kev to 1 MeV with 0% systematics. Model : a broken power law with E break fixed to 100 kev Photon Index 1 : 2.08 ± 0.01 Break Energy : kev frozen Photon Index 2 : 2.23 ± kev: ph / cm 2 s kev Extrapolated 1 kev : 9.3 ph / cm 2 s kev A single power law is rejected: An F-test relative to the broken power law excludes it with a probability of
5 3. The INTEGRAL Crab: We then fit simultaneously JEM-X, ISGRI and SPI data with an absorbed broken power law with E break fixed to 100 kev and N H fixed to cm -2. JEM-X 1 / 2 data have been used from 3 to 25 kev (15 ks in revolution 300, see Section 2.1). ISGRI data have been used from 14 kev to 1 MeV (16 ks in revolution 300), but with OSA-7.0 standard response matrix (see Section 2.2). SPI data have been used from 23 kev to 1 MeV (see Section 2.3). Systematics have been added at a level of 3% for JEM X-1 & 2 and 1% for ISGRI and SPI. Results: Model: a broken power law with E break fixed to100 kev plus an absorption with N H fixed to cm -2. Photon Index 1 : ± Break Energy : kev (frozen) Photon Index 2 : 2.22 ± kev: ph / cm 2 s kev factor SPI fixed to 1.0 factor ISGRI : 0.99 ± factor JEM X-1 : ± factor JEM X-2 : 1.06 ± Notes: Residuals are in sigma units in all figures. Statistical errors on best-fit parameters have been calculated with Xspec but are just indicative as complete ones depend on systematic level, binning, etc. 4. Conclusion The INTEGRAL instruments give consistent results on the Crab Nebula spectrum, with a global shape in agreement with observations from previous experiments. Moreover, we have shown that for the ARFs and RMF provided with OSA-7.0, the crossnormalisation factors between SPI, ISGRI and JEM-X are compatible with 1.0 within reasonably small errors, and the shape of the combined spectrum is consistent with those for the single instruments in the overlapping energy windows. This demonstrates that INTEGRAL can provide reliable spectra over its wide energy range. This paper is mainly based on a document provided to the Integral User Group by instrument teams. See 5
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